Don't worry about tiny fluctuations in your weight.

不用为体重的轻微波动而担心。

Much of the seasonal fluctuation in death rates was caused by cold, the researchers concluded.

研究者们总结说，死亡率的季节性波动大部分是由寒冷引起的。

daily fluctuations in core body temperature.

核心体温的日常波动。